of technology , reducing the water heating process , results in lower CO2 emissions and the use of less energy-consuming generators . Along with this project , a system for rainwater recovery was proposed , in keeping with the idea that , in an increasingly difficult context of water resource supply and management , it is necessary and a must to adopt , both for new constructions and in already existing ones , solutions aimed at achieving acceptable levels of building sustainability . According to the present Italian legislation , rainwater , once collected , can be used to irrigate public or condominium green areas , to wash paved areas , for technological use , to fill WC flushing systems , for water distribution on underground levels and , finally , for air conditioning systems . For the work proposed in the project to modify the system , regulation Uni en 12056-3:2001 and din 1989-1:2000-12 were used as references . Therefore , during an initial phase , a study was carried out to establish the required parameters to modify the system , such as , the total rainwater flow , the catchment surface area and the runoff coefficient . Using the ex-Roma Urbe meteorological station of the Municipality IV , data on yearly rainfall levels was gathered , information necessary to calculate the total rainwater runoff in catchment surface areas7 and to evaluate the average annual rainfall . The water need was , instead , established depending on the type of use , the quality , the number of users and the quantity and type of services required , then , later the maximum volume of rainwater collected was identified and , finally , the tank sizes were estimated . As far as the positioning of the eight 10.000 litre cisterns was concerned , it was proposed to locate them in the space available at the basement level , to avoid excessively increasing the load on the overhead floors . Finally , once the monthly balance was calculated between the net volume of rainwater collected from the covered surface areas and the internal need , it was decided to use the collected water only to irrigate the green areas . In fact , the recovered water is always equal to that collected and is not sufficient to fully meet that required for other eventual uses . The actual carrying out of the work planned in the redevelopment project , which would result in a marked improvement in the whole complex ’ s energy efficiency , would mean moving the families presently living in the buildings marked for renovation . Therefore , it appears evident that the management of the entire operation should forecast more phases , of which the first should be to construct a new building and its accompanying services , so that in the second phase , that concerning the work on the first two levels of Building A , the inhabitants of 32 duplex apartments would find themselves temporarily accommodated in the newly completed building . Then , the demolition of Building D could be forecasted and also the construction of the garage . The occupants of the 30 apartments in the building could be moved permanently to the new building . It would be , in fact , enough to use the apartments in Building H , one of the two tower blocks , numbering 30 dwellings , or a more homogeneous allocation of the inhabitants could be considered among the different new buildings . Also in the case of the changes foreseen for the 32 simplex apartments in Building A to be allocated to single people and / or disabled and for the neighbouring apartments which should be then modified ( for a total of 64 units ), the inhabitants could be transferred to the new homes on the first two levels of the same Building A ( phase 1 ), where there would have already been completed more apartments compared to the existing number . Although quite synthetic , the project experience conducted on the Vigne Nuove settlement has shown how , in the framework of the enormous patrimony of social housing existing in Italy , it is possible to intervene8 , to increase the energy efficiency of single buildings and of a whole complex through technical solutions which individuate a converging of prefabricated construction systems , features of the public building of the seventies and the present new construction methods . Often , the work carried out on social housing buildings results in marked alterations and increases in size , and , unfortunately , changes to the architectural language are all too frequent . However , in the case of complexes which over the years have become examples of a specific planning and design by groups of brilliant professionals , the approach should change , with it
Energy retrofit for Rome municipality ’ s residential real estate ( ATER ) 711